He was elected to the lower house of Bihar legislature as a candidate of Rashtriya Janata Dal (RJD) in 2015.

In 2020, the RJD chose Santosh Kushwaha, replacing him, as party candidate for the Kesaria Assembly constituency.

[2] Hence, he contested the Bihar Assembly elections of 2020 as an independent candidate, losing to Shalini Mishra of Janata Dal (United).

[3] He is contesting the 2024 general election from Purvi Champaran as an alliance candidate of the Vikassheel Insaan Party.

Kumar was not allotted the symbol of RJD; hence decided to contest independently, without affiliation of any political party.